Macabre symbols of death and mummies on display set the tone of this Italian purgatory church.

A dead saint, a deadly poison, and a mysterious holy ooze.

An institution dedicated to the towering buildings that make up skylines in New York City and around the world.

See how paper is made the old-fashioned way.

The Frank Zappa fan club erected this monument to their prog-rock hero to mark a new era of post-Soviet Lithuania.

A series of playful yellow penguins share a serious message about the environment.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Macabre astrological automaton clock dating to the late 1400s.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This dizzying tower was built to better broadcast the 1980 Moscow Olympics.

A cave in southern Italy adorned with thousand-year-old Biblical frescoes existed in obscurity until fairly recently.

An abandoned resort in North Macedonia is a relic from the Communist Party of Yugoslavia.

This fortress dates back to the 6th century and is also the site of a controversial abandoned restoration project.

At more than 5,000 years old, these structures are among the oldest free-standing stone buildings in the world.

This century-old grotesque has a mysterious history and may not actually be a rabbit.

This sculpture commemorates a naturalist and an illustrator whose work was a forerunner to modern field guides.

A shining memorial to a Belgian hero is said to bring luck to anyone who touches it.

An enormous steel waterfall is a nod to the substance that shaped Britain's Steel City.

Winner of the Leeds Award for Architecture and the Environment.

The yawning maw of this pagan visage is said to bite off the hands of liars.

An unremarkable wooden wheel built into the side of one of Rome's oldest hospitals was part of a policy to reduce infant exposure.

The charred, dead skeleton of an oak tree is said to have consoled a dying 16th-century Italian poet.